Take a look at Extutils::Installed and Sort::Versions.

$ perl -wl
use strict;
use ExtUtils::Installed;
my $instmod = ExtUtils::Installed->new();
foreach my $module ($instmod->modules()) {
  print $module;
  print $instmod->version($module);
}
__END__
Algorithm::Diff
1.1902
Apache::Session
1.80
Archive::Tar
1.30
Archive::Zip
1.16
Array::RefElem
1.00
...
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